Won't start

My gfs Chevy traverse won't start. It has always been fine. She pulled into a parking lot to drop off the kids at daycare, came back out, and it cranks but won't start. I went over on my lunch break and tried, still doing it. Disconnected the battery for 15 mins and still nothing. Any info would be great. She doesn't have nav nor onstar just a simple basic vechial.

Actually I didn't listen to it. But I'm sure that would be fine
any other suggestions? We have never had any issues
with this. She also said she heard a loud buzzing sound
when she tried it once but when I looked at it I didn't hear it
one bit

has it got gas in it the buzzing could be the pumps running dry, my
advice to you is to take your automobile to your local shop and a
qualified technician should be able to diagnose the malfunctioning
buzzing sound

It was morning and I stopped to get gas. When I got back in my car to start it
the motor just cranked and wouldn't start. It did this 3 times. I turned the key
off after each time. On the 4th try it...

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